Telegraph circuit-closing and signaling system.



F. A. ANDERSGN.

TELEGRAPH CIRCUIT CLOSING AND SIGNALING SYSTEM.

' APPLICATION FILED MAR. 2, 1917.

1 51 32@o Patented Dec. 25, 1917.

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A TTORNE Y8 UNITE SA TELEGRAPH CIRCUIT-CLOSING AND SIGNALING SYSTEM.

Specification of Letters Patent.

Patented Dec. 25, 191?.

Applicationfiled March 2, 1917. Serial No. 151,991.

To all whom it may concern:

Be it known that I, FREDERICK A. ANDER- SON, a subject of the King ofEngland, and a resident of Portage la Prairie, in the Province ofManitoba and Dominion of Canada, have invented a certain new and usefulTmprovement in Telegraph Circuit-Closing and Signaling Systems, of whichthe following is a specification.

My invention relates to improvements in telegraph circuit closing andsignaling systerns, and it consists in the combinations, constructions,and arrangements herein described and claimed.

. An object of my invention is to provide a system by means of which atelegraph circuit at a local ofiice which is open, as for instance whenthe switch is left open, the relay wire broken, or from any other cause,may be closed from a central ofiice.

A further object of my invention is to provide a system of the typementioned in which signals will be sent to the central oiiice indicatingthe particular local ofice at which the open circuit or break occurs.

A further object of my invention is to pro vide a system in which thebreak in the circuit at the local oifice is indicated by an audiblesignal at the local ofiice which is set in operation from the central orhead ofice.

Other objects and advantages will appear in the following specification,and the novel features of the invention will be particularly pointed outin the appended claims.

My invention is illustrated in the accom panying drawings, forming partof this application, in which:

Figure 1 is a diagrammatic view showing the circuit connection at thelocal station;

Fig. 2 is a perspective view of a portion of the apparatus at the localstation;

Fig. 3 is a side View of the apparatus shown in Fig. 2, and

Fig. 4 is a section along the line 44 of .Fig.

In carrying out my invention I provide each local station with thefollowing apparatus: A magnet 1 has an armature 2 on the end of a. lever3 which is pivoted at 4 to a post or support 5. This lever is bent, asshown in Figs. 1 and 3, and one end of it is arranged to engage a stop 6carried by a armature 2 in close wheel 7. The lever 3 is provided with abent end 3 which extends in the path of the stop member 6.

Mounted on a shaft 8 is a disk 9 whose outer edge is made in the form ofa spiral, so as to provide a shoulder 9". The disk is provided with aseries of oppositely proecting pins 10, these pins indicating the numberof the station. In the present instance three pins are shown. There is alonger pin 11 also provided on the disk.

A spiral spring 12 surrounds the shaft 8, being attached thereto at oneend, the other end being attached to the frame of the device,'as shownin Fig. 3. A gear wheel13 on the shaft 8 transmits motion to the shaft7*, by any suitable gearing not shown.

Pivotally mounted at 14 is a bell crank lever having a contact 15 at oneend arranged to engage a contact 16. The other arm of the bell cranklever is provided with a pivoted arm 17 which is normally pressed on bya spring 18 to hold the arm 17 in the position shown in the drawings. Abell crank lever 19 is pivoted at 20, one end bearing a contact 21arranged to engage a contact 22, and the other end restingagainst theend of a set screw 23, see Fig. 3.

An audible signal 24, such as a buzzer or a bell, is in a local circuitwith a battery B, which local circuit is arranged to be closed by theengagement of the contacts 21 and 22 in the manner hereinafterdescribed. The main telegraph line is shown at L and L.

At S I have shown a switch, which is adapted to throw into circuit therelay R of the local set, of which the key K forms a part.

In shunt around this local telegraph circuit is a wire 26 which connectswith a wire 27 leading to the contact 16. A wire 28 connects the contact15 with the line wire L. The magnet 1 is bridged across the shuntcircuit between the wires 27' and 28 in series with a condenser Q.

A lever 30 is pivoted at 31, and has an arm 32 extending upwardly, thebent end 33 of the arm resting on the periphery of the disk 9. The lever30 is provided at its end with a hook 34 which is arranged to engage thelever 3 at 35 so as to raise the latter, as will be hereinafterexplained, and to hold the the magnet 1.

proximity to the core of other the circuit is left open.

From the foregoing description of the various parts of the device, theoperation thereof will be readily understood.

Let us assume that from some cause or The attend ant at the central orhead office puts an alternating current generator G on the line, as forinstance, the line L in Fig. 1. This alternating current will notafi'ect the relay R because the circuit is broken, but it will pass thecondenser and will actuate the magnet 1. The armature 2 is attracted andbeing attached to the lever 3, the latter is moved so that the end 3 iswithdrawn out of the path of the stop member 6 on the wheel 7 therebypermitting the wheel 7 to revolve. After the wheel 7 has made a fewrevolutions, the bent end 33 of the arm 32 has moved away from theshoulder 9*, due to the revolution of the disk 9 in a clockwisedirection. This draws the arm 32 upward, and hence raises the lever 30which engages the lever 3 and holds the armature 2 down on the core ofthe magnet 1, thereby permitting the wheel 7 to continue itsrevolutions, without the aid of the alternating current to hold thearmature 2 down any longer than necessary to set in' motion the holdinglever 30.

As the disk 9 revolves, the pins 10 come into engagement with the arm 17on the bell crank lever. The contact 15 which is carried on the oppositeend of the 'bell crank lever is moved into enga ement with the contact16 and after the pin has passed the lever falls back into its originalposition. This causes a closing of the circuit of the main line eachtime one of these pins passes. the present instance there are three ofthe pins 10, and thus three impulses are transmitted to the central'ofiice, thus indicating the particular station on the line at which thebreak or open circuit has occurred.

' On the further movement of the wheel 9, the long pin or arm 11'engages the bell crank lever 19, 'which the short pins 10 have notengaged. It moves this bell crank lever so as to close the contacts 21and 22, and it also moves the lever so as to cause the movement of theother bell crank lever, thereby closing the contacts 15 and 16. Thisalso causes'the stopping of the wheel 9.'

The contacts 15 and 16 being closed, the main line is now again inoperative position so that if the operator at the local office should beabsent, communication would again be established on the main lineregardless of his absence.

The closing of the contacts 21 and 22 throws the audible signal 24 onthe local line and gives indication to the local operator that somethingis wrong.

When the operator has determined the cause of the break he turns thewheel backwardly until the shoulder 9 engages the bent portion 33 of thearm 32. For the purpose of perfecting this return movement easily, llprovide the hand wheel 35 on the shaft 8. Resetting of the wheel 9rewinds the spring to which this wheel is attached. The parts will thenassume their normal position shown in Fig. 1.

It will thus be seen that T have provided a device which not onlynotifies the main oflice of the particular station at which a break incircuit occurs, but also closes the line and gives an audible signal tothe local operator, notifying him that something is wrong.

While I have described a particular form of mechanism for accomplishingthe result named, at the same time it is obvious that other forms mightbe substituted without departing in the least from the spirit and scopeof the invention.

T claim:

1. In a telegraph system having a main office and local stations eachprovided with a telegraph set, the combination of means at each localstation actuated from the main ofrice for closing the main line and forsending the signal to the main oifice for identifying the local station.

2. In a telegraph system having a main ofiice and local stations eachprovided with a telegraph set, the combination of means at each localstation actuated from the main ofiice for closing the main line and forsending the signal to the main oflice for identifying' the localstation, and means actuated by the first named means for sounding anaudible signal at the local station.

3. in a telegraph system having a main ofice and local stations eachprovided with a telegraph set, the combination of a shunt circuit aroundsaid telegraph set, said shunt circuit being normally open, and meansoperated from the main oflice for closing the shunt circuit apredetermined number of times, said number being different for eachdifferent station and for subsequently leaving the shunt circuit, inclosed position.

4. In a telegraphsystem having a main ofice and local stations eachprovided with a telegraph set, the combination of a shunt circuit aroundsaid telegraph set, said shunt circuit being normally open, meansoperated from the main ofiice for closing the shunt circuit apredetermined number of times, said number being different for eachdifferent station and for subsequently leaving the shunt circuit inclosed position, said means comprising a spring actuated wheel providedwith a series of pins corresponding to the number of the stations, and amovable contact arranged to be actuated by the successive engagements ofthe pins, and mplanls for starting the movement of the w ee 5. In atelegraph system having a main 17 0 taeisao office and local stationseach provided with a telegraph set, the combination of a shunt circuitaround said telegraph set, said shunt circuit being normally open, meansoperated from the main office for closing the shunt circuit apredetermined number of times, said number being dili'erent for eachdifferent station and for subsequently leaving the shunt circuit inclosed position, said means comprising a spring actuated Wheel providedwith a series of pins corresponding to the number of the stations, and amovable contact arranged to be actuated by the successive engagements ofthe pins, a stop lever for normally preventing the movement of saidWheel, and a magnet for actuating said stop lever to permit the movementof the Wheel.

6. In a telegraph system having a main oflice and local stations eachprovided With a telegraph set, the combination of a shunt circuit aroundsaid telegraph set, said shunt circuit being normally open, meansoperated from the main ofiice for closing the shunt circuit apredetermined number of times, said number being diflerent for eachdifferent station and for subsequently leaving the shunt circuit inclosed position, said means comprising a spring actuated Wheel pro videdWith a series of pins corresponding to the number of the stations, and amovable contact arranged to be actuated by the successive engagements ofthe pins, a stop lever for normally preventing the movement of saidWheel, and a magnet for actuating said stop lever to permit the movementof the Wheel, said magnet being in series With a condenser and beingbridged across said shunt circuit.

FREDERICK ALEXANDER ANDERSON.

